title: Hardware-efficient autonomous quantum memory protection.
abstract: We propose to encode a quantum bit of information in a superposition of coherent states of an oscillator, with four different phases. Our encoding in a single cavity mode, together with a protection protocol, significantly reduces the error rate due to photon loss. This protection is ensured by an efficient quantum error correction scheme employing the nonlinearity provided by a single physical qubit coupled to the cavity. We describe in detail how to implement these operations in a circuit quantum electrodynamics system. This proposal directly addresses the task of building a hardware-efficient quantum memory and can lead to important shortcuts in quantum computing architectures.
authors.affiliation: INRIA Paris-Rocquencourt, Domaine de Voluceau, Boîte Postale 105, 78153 Le Chesnay Cedex, France and Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA.
authors.forename: Zaki
authors.initials: Z
authors.lastname: Leghtas
authors.forename: Gerhard
authors.initials: G
authors.lastname: Kirchmair
authors.forename: Brian
authors.initials: B
authors.lastname: Vlastakis
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Schoelkopf
authors.forename: Michel H
authors.initials: MH
authors.lastname: Devoret
authors.forename: Mazyar
authors.initials: M
authors.lastname: Mirrahimi